CN109570808A

CN109570808A - A kind of method and device improving narrow lap welder weldquality

Info

Publication number: CN109570808A
Application number: CN201710909237.5A
Authority: CN
Inventors: 龚辉; 李宏; 李辉; 唐智雁
Original assignee: Baoshan Iron and Steel Co Ltd
Current assignee: Baoshan Iron and Steel Co Ltd
Priority date: 2017-09-29
Filing date: 2017-09-29
Publication date: 2019-04-05
Anticipated expiration: 2037-09-29
Also published as: CN109570808B

Abstract

A kind of method and device improving narrow lap welder weldquality, comprising: 1) temperature for temp probe control to soldering joint automatic tracking, 2) temperature probe being kept to detect is constant, and 3) on-line checking, evaluation are carried out to weldquality.Firstly, determining the optimum temperature that temperature probe should detect when welding；Welding experiment is carried out to substrate plate, determines that optimal quality information curve and greatest drawback allow figure-of-merit curve, establishes figure-of-merit curve database；By quality information curve and real-time detection to weldquality information curve matched, as in database quality information curve (best curve similarity) and the weldquality information curve similarity that arrives of real-time detection 80% or more, display module shows " qualification ", as in database quality information curve (best curve similarity) and the weldquality information curve similarity that arrives of real-time detection below 80%, display module shows " unqualified " that warning device carries out warning note.

Description

A kind of method and device improving narrow lap welder weldquality

Technical field:

The present invention relates to metallurgical weld technical fields, and in particular in sheet band steel strip roll bending weld technology, improves The method and apparatus of narrow lap welder weldquality.

Background technique

For the continuity for guaranteeing Tinplate Production, substrate is needed forward strip with after before entering acid cleaning process section Continuous strip is attached by the method welded.

Substrate is in entire electroplating process, by jockey pulley, by the bending in the case of receiving hightension repeatedly, weldering Disconnected band often occurs for seam connecting portion.And disconnected band will cause the damage of working roll, or even will cause the stoppage in transit of entire unit, drop Low production efficiency causes greatly to lose to the production of tin plate.

Due to the thin gauge average thickness usually only 0.15mm or so of tin plate, the connection of this strip is taken frequently with narrow Welder is welded, and the Fundamentals of Welding of the welding machine are when being rolled at two coil of strip headtotails by upper and lower two welding wheels, By electric current in welding wheel, using the resistance of strip itself, strip end to end between and strip and the contact resistance of welding wheel caused by Heat increases belt steel temperature, and is finally welded two coil of strips of fusing end to end by means of the pressure of the pneumatic cylinder of welding wheel Come, weld seam is flattened by rolling wheel form roll seam-welding again, and the flatness of weld seam is improved.

However, being found by field investigation, the defects of narrow gap electric resistance welding weld seam can have incomplete fusion and burn, and weld seam The main reason for defect is broken caused by being with accident, has seriously affected the continuity of Tinplate Production.

At present on production line strip steel weld joint quality superiority and inferiority, rely primarily on the surface matter of worker's naked eyes empiric observation weld seam Amount, this judgment method human factor is very big, cannot be completely analyzed to weld defect, there are significant limitations.It is domestic The outer method for welding quality inspection mainly has: the detection in temperature field, coaxial real-time detection and video-aware system.Temperature The mode of field and coaxial real-time detection is indirect monitoring welding process, and video-aware system can only then detect weld seam upper surface Defect, three of the above method cannot timely, accurately, reliably reflect weldquality.

We do not have found related patents by retrieval " weld defect " and " EDDY CURRENT "；Pass through retrieval " narrow overlap welding Machine " finds 5 patents of invention, 9 utility model patents altogether.By similarity, technology is carried out for following representational patent It compares, does not find similar technology and methods.

The method that a kind of full-automatic narrow lap welder of patent No. CN201110040990.8 " increases online annealing function " and A kind of method annealed on narrow lap welder to 45 steel weld seams of patent No. CN201110040881.6 " ", which is characterized in that To weld seam loading current again after the completion of welding, so that weld seam fever is reached annealing temperature and realize annealing.And by man-machine interface On three loading current, pressure and the speed of service parameters are set, make weld seam heat temperature reach annealing process requirement. This kind of Technology application, although the internal stress that can effectively change weld seam improves weldquality, is not related to weld seam in cold rolled sheet Quality detection technology, can not prevent welding when caused by defect.

Patent No. CN201510235330.3 " a kind of narrow overlap joint welding technique of cold-rolled biphase steel band " and the patent No. CN201610162706.7 " welding method of 980MPa rank cold-rolled biphase steel " relates generally to the welding side of cold-rolled biphase steel Method, they are welded using narrow lap welder, preceding coiled strip steel magnetic tape trailer and rear winding steel taping head entrance are sheared, then mutually Overlap joint is welded, and determines welding current, speed of welding, welding wheel pressure, welded lap amount, the parameters such as welding compensation rate, realization The narrow overlap joint welding operation of cold-rolled biphase steel band provides condition for cold-rolled biphase steel band continuous production.And this patent is related to Tin plate continuous production provides a kind of weld seam detection and improves the dynamic approach of weldquality, and the two does not have positive connection.

Patent No. CN201610997659.8 " a kind of to roll narrow lap welder and welding procedure and its movable liner plate " is main In order to solve the problems, such as since there are unreasonable structures for the existing movable liner plate that rolls narrow lap welder, in production run often Be sheared take the lead, the damage of magnetic tape trailer short slab, cause welding machine because mobile card resistance is without that can smoothly complete welding procedure, and then cause to aluminize The problems such as zinc unit reduction of speed is even shut down, patent point are unrelated with the art of this patent mainly in the setting of movable liner plate.

In addition, the utility model of patent No. CN201621137054.3 " rolling wheel of the narrow lap welder of strip ", passes through knot Structure improves, and rolling wheel is made to change into rolling friction by original sliding friction, solves the movement of rolling wheel wheel body and has some setbacks, is easy pressure The problem of bad weld seam, with this patent without technology correlation.

The utility model of patent No. CN201020524439.1 " Three-piece type clamping device of narrow lap welder " is solved to work as and be cut When taking the lead to stick together of rear two layers of strip is cut, magnetic is carried out to strip respectively by magnetic attraction component, thus by two layers of band Steel takes the lead to separate by force, avoids the problem that rosin joint occurs because taking the lead adhesion or can not weld, with this patent without technology correlation.

The utility model of patent No. CN201120196230.1 " narrow lap welder current control device " a kind of, it is by signal Amplifier, change-over switch, filter circuit, current control circuit, timing circuit composition can eliminate welding error signal, solve welding The excessive problem of current fluctuation in starting process is connect, makes welding wheel that electric current be not added when just contacting strip, to avoid welding wheel Damage, with this patent without technology correlation.

Pass through Technical comparing and field investigation, it has been found that during strip steel weld joint formation, the quality and weldering of weld seam Connect that the factors such as electric current, welding pressure are related, in the temperature for embodying a concentrated reflection of weld seam of these factors, therefore during appearance of weld Temperature plays a key effect to weldquality.Weldquality usually passes through the method monitoring weld seam matter of monitoring weld seam temperature at present Amount just can guarantee the precision of detection only when temperature measuring point is relatively fixed.

As influence tin plate quantity-produced principal element, the disconnected band of weld seam and weld defect close relation.Therefore, Control, raising welding quality and accurate evaluation weldquality are the key points for reducing thin gauge tin plate broken belt rate.

Summary of the invention

Welding state variable (welding current, welding pressure) is monitored and is estimated in narrow lap welder welding process Weldquality is counted, weldquality cannot directly be detected, evaluate, it can not be to weld defect realization rapidly on-line checking Situation, design is a set of to adjust and evaluate weldquality system and device according to on-site actual situations and directly, accurately.

Welder system flow chart of the invention is as shown in Figure 1, it mainly passes through the automatic control of temperature probe temperature measuring point System；Welding machine parameter is automatically adjusted by the feedback of temperature information；The aspect of weldquality etc. three is analyzed, judged to Pulsed eddy current testing Content realizes that welding machine accurately can adjust and evaluate weldquality by real-time condition.

Technical scheme is as follows:

A method of improving narrow lap welder weldquality, which is characterized in that include the following steps:

1) control of the temp probe to soldering joint automatic tracking

Thermometric drive module 7 is mounted on lower 8 front end of welding wheel, close to weld, weld point temperature when detection is welded, thermometric is driven Dynamic model block 7 includes stepper motor (11,12), displacement sensor (14,16), temperature probe 15 and probe bracket 13, displacement sensing Device detect temperature probe vertical direction (i.e. Y-axis gravity direction) and vertical X axis, Y-axis Z-direction weld point temperature,

If weld seam fluctuations in the vertical direction, information is collected by Y-direction displacement sensor 16, by information by A It is transferred to embedded software in a computer after D conversion, after the data of software analyte sensors, determines whether Y-direction needs to adjust And adjustment amount number, then send an instruction to ARM7 module, ARM7 control Y-direction stepping motor 12 keeps temperature probe 15 dynamic Make to guarantee that temperature measuring point Y-direction position is relatively fixed；

Equally, the displacement difference in Z-direction between lower welding wheel 8 is detected by Z-direction displacement sensor, passes through A/D module and meter The analysis of calculation machine finally controls the movement of Z-direction stepping motor 11, thus guarantees the temperature probe 15 in Y-direction, Z-direction simultaneously Relative position, realize the control to soldering joint automatic tracking,

2) temperature for keeping temperature probe to detect is constant,

The temperature information that temperature probe 15 will test is transferred to temperature data processor, and temperature data processor is to information Preliminary treatment is done, the data handled well are transferred to temperature data acquisition module, temperature data acquisition module does into one information Step processing, the information handled well is transferred in computer embedded software, software passes through temperature data acquisition module is further The information and optimum temperature value of processing compare, and send regulating command and automatically adjust the real-time welding current of welding machine, to guarantee that thermometric is visited The temperature that head detects is kept constant；

3) on-line checking, evaluation are carried out to weldquality,

A determines survey when welding firstly, determine the influence degree of welding parameter butt welding seam welding quality by orthogonal experiment The optimum temperature that temperature probe should detect；

B determines optimal matter by the convex experiment of experience and 25-35 secondary cup secondly, to substrate plate progress Welding experiment Amount information curve and greatest drawback allow figure-of-merit curve, establish figure-of-merit curve database；

Weldquality information after the welding of c real-time detection, weldquality original data transmissions are to matter after the welding that will test Data processor is measured, qualitative data processor does preliminary treatment to initial data, the data handled well are transferred to qualitative data Acquisition module；

D quality data collection module is further processed data, by the data handled well be transferred to computer embed it is soft In part, by call quality information curve and real-time detection in database to weldquality information curve matched,

The weldquality information that quality information curve (best curve similarity) and real-time detection in e such as database arrive is bent 80% or more, display module is shown " qualification " line similarity, and warning device is silent；

Weldquality information as the quality information curve (best curve similarity) in database is arrived with real-time detection is bent For line similarity 80% hereinafter, display module is shown " unqualified ", warning device carries out warning note.

A kind of method improving narrow lap welder weldquality according to the present invention, which is characterized in that

In the e of step 3), the adjusting situation of display module real-time display welder parameter welds coil of strip information, welding The real time information curve of weldquality afterwards, final analysis, judging result etc..

In step, 3) a, when carrying out Welding experiment to substrate plate, move ahead coil of strip plate thickness 0.14-0.19mm, rear row steel Roll bending thickness 0.14-0.19mm carries out 25-35 welding and the convex experiment of cup, determines that temperature probe should detect most when welding Good temperature.

In step, 3) b is fitted mass by least square method when carrying out Welding experiment to common substrate plate Information curve determines that optimal quality information curve and greatest drawback are allowed by the convex experiment of the experience and 25-35 secondary cup of people Figure-of-merit curve establishes figure-of-merit curve database.

In step 1), thermometric drive module 7 is mounted on lower 8 front end of welding wheel close to weld, detects solder joint temperature when welding Degree.

In step, 3) thermometric drive module 7, is mounted on the rear of upper rolling wheel 3, weld seam after real-time detection welding by c Quality information.

In step, 3) b, passes through the experimental datas such as EDDY CURRENT, tension test, metallographic test and field working conditions and people For experience, optimal weldquality information curve y* (x) is determined, lack for the excessive maximum for generating burn-through defect of welding current It falls into and allows figure-of-merit curve a* (x) and allow figure-of-merit curve b* for the too small greatest drawback for generating incomplete fusion defect of welding current (x)。

In step, 3) e:

(1) such as weldquality curve y (x) and best in quality information curve y* (x) similarity judge weld seam matter less than 80% Measure unqualified, weld seam need to weld again；Conversely, being judged as qualified, allow to let pass；

(2) such as y (x) and greatest drawback allow figure-of-merit curve a* (x) similarity to be greater than 95%, judge that weld seam is unqualified, weld Seam need to weld again；Conversely, being judged as qualified, allow to let pass；

(3) such as y (x) and greatest drawback allow figure-of-merit curve b* (x) similarity to be greater than 95%, judge that weld seam is unqualified, weld Seam need to weld again；Conversely, being judged as qualified, allow to let pass.

(4) A/D conversion is carried out to data by data collecting card, analog data is converted into digital quantity voltage value Volt (i)；If data Volt (i) is greater than the greatest drawback peak value allowed, that is, the defect threshold value MAX1 of incomplete fusion defective value is corresponded to, calculated Its number N1 judges that weldquality is unqualified, weld seam need to weld again if ratio N1/n is greater than 60%；

Conversely, being judged as qualified, allow to let pass；

N is detection data total number, and N is the total number of the number in all data Volt (i) greater than defect threshold value MAX1；

(5) as data Volt (i) is less than defect threshold value MAX2, (data Volt (i) and defect threshold values MAX2 must be said Bright and its source), its number N2 is calculated, ratio N2/n is greater than 30%, judges that weldquality is unqualified, weld seam need to weld again；

Conversely, being judged as qualified, allow to let pass；

(6) such as data Volt (i) is greater than all statistical average AVG, its number N3 is calculated, as ratio N3/n is greater than 50%, judge that weldquality is unqualified, weld seam need to weld again；

Conversely, being judged as qualified, allow to let pass；

Statistical average AVG refers to the sum of all data Volt (i) divided by Data Detection data total number.

(the defect threshold value MAX1 of corresponding incomplete fusion defective value: when weld seam electric current is smaller, there are incomplete fusion defect, vortex letters Number display amplitude is bigger, the welding plate separation up and down of corresponding weld seam it is more serious, it is corresponding on the contrary, eddy current signal shows that amplitude is smaller Weld seam up and down welding plate separation it is smaller.)

In (6), this standard mainly judges whether the fluctuation of eddy current signal is steady, if ratio is greater than 50%, illustrates whirlpool Peak value and the valley for flowing signal are larger, and there are welding defects.Eddy current signal vibration frequency is higher, and weld seam tensile strength is smaller；Whirlpool Signal cataclysm is flowed, weld seam tensile strength is smaller.

In step, 3) e:

(7) if the numerical value of Volt (i) and Volt (i+1) differs greatly, judge that burn-through situation is locally present in weld seam, prompt behaviour Make worker and checks face of weld situation and adjustment welding machine parameter etc. in time.

(8) if continuous several above defect threshold values of Volt (i) and fluctuation is very small, illustrate that there are edges within the scope of this Fusion length direction it is biggish burn-through or incomplete fusion situation, this weld seam judge according to the length of axial crack it is qualified or not, this It is to judge that weld seam is unqualified that situation, which is the 20% of length, needs to weld again.

Judge the foundation of database,

The progress such as substrate plate, different welding manners, different welding parameters for narrow gap electric resistance welding are real It tests, establishes the database of complete set.

Such as: move ahead strip steel specification width 838mm, thickness 0.15mm, and is mild steel；Subsequent strip steel specification width 838mm, thickness 0.17mm, are similarly mild steel.In response to this, the welding for carrying out 100 weld seams, it is different by controlling Welding current is welded, and obtained weld seam carries out EDDY CURRENT first, and pass through least square to the data detected Principle carries out the fitting of weldquality curve, secondly carries out tension test to the different piece of weld seam, determines that the tension of weld seam is strong Degree, again according to weld seam scene work the case where, amid all these factors determine the best weldquality information of this kind of situation Curve y* (x), figure-of-merit curve a* (x) is allowed for the excessive greatest drawback for generating burn-through defect of welding current and and is directed to The too small greatest drawback for generating incomplete fusion defect of welding current allows figure-of-merit curve b* (x).

According to the research of eddy current signal and weldquality relationship, it has been determined that eddy current signal is determined with weld seam tensile strength Magnitude relation establishes weld seam tensile strength and the one-to-one relationship of eddy current signal magnitude, i.e. eddy current signal magnitude is bigger, weld seam Tension tensile strength is lower；Eddy current signal vibration frequency is higher, and weld seam tensile strength is smaller；Eddy current signal cataclysm, weld seam tension Intensity is smaller etc..The selection of defect threshold values is by statisticalling analyze ACCESS data-base recording result and showing after the operation of scene Practical disconnected accurate, the reliable numerical value obtained with situation in field.

By being lacked by best weldquality information curve y* (x), for the excessive maximum for generating burn-through defect of welding current It falls into and allows figure-of-merit curve a* (x) and and allow quality bent for the too small greatest drawback for generating incomplete fusion defect of welding current Line b* (x) record, and defect threshold values MAX1, defect threshold values MAX2, average value AVG are recorded simultaneously, then is carried out by VB6.0 Programming is written into detection evaluation software, establishes figure-of-merit curve and defect threshold values database.The foundation of database can be inspection Automation is realized in the evaluation for surveying evaluation system, is kept evaluation result more accurate, reliable, be ensure that the high quality of detection evaluation system Operation.

Detection is scanned to sample using differential type probe sensor, during installation, needs to make probe and face of weld Between the distance 1-2mm that keeps constant.

Differential type probe is one kind of eddy current probe.Differential type probe is identical with test specimen phase separation by two or more Balance coil composition.It is designed to selectively respond the change dramatically of test specimen, such as crack, stomata etc., and to material or several The slowly varying and longer continuous defect of what shape is insensitive, but its mentioning to the response signal of different affecting factors generation It takes and handles and is more convenient.Since the defect being primarily present in weld seam is burn-through and incomplete fusion etc., belong to saltant type defect, because This is scanned sample using differential type probe sensor.

When being scanned detection to sample using differential type probe sensor, moved along the gap between two clamping platforms, two Gap between clamping platform is 8-10mm, the diameter 6-10mm of differential type probe.

Preferably, differential type probe diameter D=8mm.

The diameter of differential type probe is too small, will affect the coiling of probe and the acquisition of signal, probe diameter D is taken after tradeoff =8mm.

The maximum temperature of metal core Temperature Distribution is lower than 200 DEG C in differential type probe.

A kind of device improving narrow lap welder weldquality according to the present invention, which is characterized in that

Temperature probe during installation, keeps constant distance 1-2mm between face of weld.

Sample is scanned using differential type probe sensor, when detection, is moved along the gap between two clamping platforms, two Gap between clamping platform is 8-10mm, the diameter 6-10mm of differential type probe.

The maximum temperature of metal core Temperature Distribution is lower than 200 DEG C in popping one's head in.

A kind of method and device improving narrow lap welder weldquality according to the present invention, which is characterized in that

Judge the foundation of database

Such as: move ahead strip steel specification width 838mm, thickness 0.15mm, and is mild steel；Subsequent strip steel specification width 838mm, thickness 0.17mm, are similarly mild steel.In response to this, the welding for carrying out 100 weld seams, it is different by controlling Welding current is welded, and obtained weld seam carries out EDDY CURRENT first, and pass through least square to the data detected Principle carries out the fitting of weldquality curve, secondly carries out tension test to the different piece of weld seam, determines the anti-of weld seam all day Tensile strength, again according to weld seam scene work the case where, amid all these factors determine the best weldquality of this kind of situation Information curve y* (x), for welding current it is excessive generate burn defect greatest drawback allow figure-of-merit curve a* (x) and and Figure-of-merit curve b* (x) is allowed for the too small greatest drawback for generating incomplete fusion defect of welding current.

According to the present invention, comprising: first part:

The Bit andits control of temp probe, the temperature control and the judgement of weldquality of weld seam.

As shown in Fig. 2, thermometric drive module 7 is mounted on lower 8 front end of welding wheel, and close to weld, solder joint when detection is welded Temperature.

As shown in figure 3, thermometric drive module 7 mainly has stepper motor (11,12), displacement sensor (14,16), thermometric to visit The composition such as first 15 and probe bracket 13.The movement of its X-direction (horizontal direction) is synchronous with lower welding wheel 8, it is ensured that the position of X-direction Setting is not in variation.

Temperature measuring point position in order to guarantee temperature probe is relatively fixed, detects two axis of temperature probe using displacement sensor Variation to position.It is respectively as follows: vertical direction (gravity direction) and is defined as Y direction, is controlled by Y-direction stepping motor 12.Vertical X Axis, Y-axis direction be known as Z-direction (from inside outwards, direction from outside to inside), by Z-direction stepping motor 11 control.

The two stepper motors are vertically fixed on together, and wherein Y-direction stepping motor 12 is fixed on Z-direction stepping motor 11 Screw rod on, probe bracket 13 is mounted in Y-direction stepping motor, and temperature probe 15 and displacement sensor (14,16) are mounted on spy On head bracket 13.So the motor that just will drive Y-direction is produced in Z-direction when Z-direction stepping motor 11 is when Z-direction moves Raw displacement, while temperature probe can also be subjected to displacement variation in Z axis.

If weld seam fluctuations in the vertical direction, information is collected by Y-direction displacement sensor 16, by information by A It is transferred to embedded software in a computer after D conversion, after the data of software analyte sensors, determines whether Y-direction needs to adjust And adjustment amount number, then send an instruction to ARM7 module, ARM7 control Y-direction stepping motor 12 keeps temperature probe 15 dynamic Make to guarantee that temperature measuring point Y-direction position is relatively fixed.

Equally, on Z axis, the displacement difference in Z-direction displacement sensor detection Z-direction between lower welding wheel 8 can be crossed, AD is passed through The analysis of module and computer finally controls the movement of Z-direction stepping motor 11.It thus ensure that in Y-direction, Z-direction, survey simultaneously The relative position of temperature probe 15, realizes the control to soldering joint automatic tracking.

The temperature of weld seam controls

As shown in Figure 1, in actual production, the temperature information that temperature probe 15 will test is transferred to temperature data processing Device, temperature data processor do preliminary treatment to information, and the data handled well are transferred to temperature data acquisition module, temperature number Information is further processed according to acquisition module, the information handled well is transferred in computer embedded software, computer passes through Serial ports is connected with welding machine, and software sends the instruction automatic adjustment real-time welding current of welding machine, by comparison optimum temperature value to guarantee The temperature that temperature probe detects is kept constant, to guarantee welding quality.

The judgement of weldquality

Firstly, patent determines the influence degree of welding parameter butt welding seam welding quality by orthogonal experiment, determine to weld Electric current is primary influence factor.Welding experiment is carried out to common substrate plate, such as the coil of strip plate thickness 0.14mm that moves ahead, rear row steel Roll bending thickness 0.14mm.30 welding and the convex experiment of cup are carried out to such situation, when determining welding, temperature probe should be detected Optimum temperature.

Secondly, Welding experiment is carried out to common substrate plate, such as the coil of strip plate thickness 0.14-0.19mm that moves ahead, rear row steel Roll bending thickness 0.14-0.19mm.30 welding are carried out to such situation, quality information curve is fitted by least square method, Determine that optimal quality information curve and greatest drawback allow figure-of-merit curve to establish by the convex experiment of the experience of people and 30 secondary cups Figure-of-merit curve database.

Eddy current probe 3 is mounted on to the rear of upper rolling wheel 3, weldquality information after real-time detection welding will test Original data transmissions give qualitative data processor, qualitative data processor does preliminary treatment to initial data, by what is handled well Data are transferred to quality data collection module, and quality data collection module is further processed data, the data that will be handled well It is transferred in computer embedded software, is believed by the weldquality for calling the quality information curve in database and real-time detection to arrive Breath curve is matched.With best curve similarity 80% or more, or with greatest drawback allow figure-of-merit curve similarity 100%, computer sends quality, and display module is shown " qualification ", and warning device is silent；Opposite, display module It shows " unqualified ", and warning device carries out warning note.

The adjusting situation of display module real-time display welder parameter welds coil of strip information, weldquality after welding Real time information curve, final analysis, judging result etc..

Warning device carries out warning note when display module shows " unqualified "；Opposite warning device keeps silent.

According to the present invention, further includes: second part: judging the foundation and EDDY CURRENT of database in criterion and evaluation system The design of probe.

1. judging the foundation of criterion.

By the experimental datas such as EDDY CURRENT, tension test, metallographic test and field working conditions and artificial experience, determine Optimal weldquality information curve y* (x) allows quality bent for the excessive greatest drawback for generating burn-through defect of welding current Line a* (x) and for welding current it is too small generate incomplete fusion defect greatest drawback allow figure-of-merit curve b* (x).Judge criterion It is as follows:

(1) weldquality curve y (x) and best in quality information curve y* (x) similarity judge weldquality less than 80% Unqualified, weld seam need to weld again；Conversely, being judged as qualified, allow to let pass.

(2) y (x) and greatest drawback allow figure-of-merit curve a* (x) similarity to be greater than 95%, judge that weld seam is unqualified, weld seam It need to weld again；Conversely, being judged as qualified, allow to let pass.

(3) y (x) and greatest drawback allow figure-of-merit curve b* (x) similarity to be greater than 95%, judge that weld seam is unqualified, weld seam It need to weld again；Conversely, being judged as qualified, allow to let pass.

(4) data Volt (i) is greater than defect threshold values MAX1, calculates its number N, and ratio N/n is greater than 60%, judges weld seam matter Measure unqualified, weld seam need to weld again；Conversely, being judged as qualified, allow to let pass.(n is detection data total number)

(5) data Volt (i) is greater than defect threshold values MAX2, calculates its number N, and ratio N/n is greater than 30%, judges weld seam matter Measure unqualified, weld seam need to weld again；Conversely, being judged as qualified, allow to let pass.(n is detection data total number)

(6) data Volt (i) is greater than all statistical average AVG, calculates its number N, and ratio N/n is greater than 50%, judgement Weldquality is unqualified, and weld seam need to weld again；Conversely, qualification is asked in judgement, allow to let pass.(n is detection data total number)

2. the foundation of database in system.

The foundation of database in detection evaluation system is carried out according to the above-mentioned judge criterion summed up.For narrow gap resistance Substrate plate, different welding manners, different welding parameters for welding etc. are tested, and the data of complete set are established Library.

3. the design of eddy current probe and

The design of eddy current probe bogey

Differential type probe is an eddy current probe, and eddy current probe is in the condition of high temperature when detecting, if using ordinary ultrasonic probe It is detected, very big influence can be caused to the detection performance of probe, it is therefore necessary to a eddy current probe resistant to high temperature must be developed. Eddy current probe during installation, needs that eddy current probe is made to keep constant distance 1-2mm between face of weld.

The characteristics of according to the requirement and EDDY CURRENT of field working conditions, design mounting bracket are as shown.The design of kidney sky is protected The controllability on bracket left and right directions has been demonstrate,proved, has guaranteed the phenomenon that will not resulting from welding machine interference when installation probe；Platform Designing It is in order to which the installation of eddy current probe cooperates, eddy current probe can be ensure that between face of weld on bracket with up and down adjustment Required distance.

The material that eddy current probe bogey is selected is a kind of highstrenghtpiston, this is the electricity in order to not influence eddy current probe Magnetic field, to guarantee excellent detection effect.The advantages of this kind of plastics is high temperature resistant, has that anti-flammability and mechanical performance are prominent, With good rigidity and toughness, and material is very stable, nontoxic, tasteless.Good mechanical performance ensure that eddy current probe position That sets is relatively fixed, and high temperature resistant can satisfy the higher requirement of field working conditions temperature.

According to the present invention, further includes: Part III: detection evaluation system.

3.1 terminate to be a complete workflow from starting to be welded to welding, and current vortex sensor lacks weld seam itself It is trapped into capable detection, detection evaluation software carries out real-time display and evaluation to it, executes this workflow repeatedly, welds to each Seam is detected, is analyzed, being evaluated, and realizes the on-line real-time measuremen evaluation of narrow gap electric resistance welding weldquality.

The transmission of 3.2 data

For the transmission process of data-signal as shown in -2, current vortex sensor detects the initial data of weldquality, transmission To eddy current flaw detec, eddy current flaw detec pre-processes data, the data handled well is transferred to data collecting card, by A/ D conversion, transfers data to computer.The sample frequency of the eddy current detecting equipment is 100Hz, that is to say, that each second can acquire 100 flaw indication data, the interference that ambient enviroment transmits data in order to prevent are connected using special anti-jamming signal line Current vortex sensor and eddy current flaw detec, and connection eddy current flaw detec and data collecting card, data collecting card select model USB5936, data collecting card are connected by USB interface with computer.

The processing of 3.3 data

Data handling procedure is divided into three phases, the first stage, and the eddy current signal of defect is to corresponding mould from weld seam The output of analog quantity；Second stage, the acquisition of analog quantity, analog quantity carry out the conversion process of digital quantity；Phase III, for weld seam Quality, the data analysis, processing, image for carrying out digital quantity are shown.In the first phase, that is, the detection process of weld defect In, seem particularly critical for the identification of flaw indication, because the detection of flaw indication is for the fine or not to Guan Chong of EDDY CURRENT It wants, -3 are shown in more detail the first stage of data processing.

Signal generating circuit generates alternating current, and the detection coil being supplied in current vortex sensor, coil is around it Alternating magnetic field is generated, while alternating magnetic field generates eddy current in detected weld seam, eddy current is by inside weld seam and surface When the influence of defect, coil is reacted on, its impedance is made to change, in the case where weld seam does not have defect, eddy current will not Variation is generated, the variable signal that detection coil generates is very small, and amplifying circuit amplifies faint detection signal first；? When detection, mechanical oscillation etc. cause the variation of relative position between detection coil and weld seam and generate noise, this noise signal Amplitude be generally higher than signal amplitude caused by tiny flaw, it is different from the phase of relative position noise signal using flaw indication The characteristics of, the analysis to phase and the inhibition to interference are realized by phase-sensitive detector, reaches inhibition interference and detects defect Purpose；It may further include shape, the ruler of weld seam in output signal other than flaw indication after the processing of above-mentioned phase sensitive detection The information such as very little and electromagnetic property, it is also necessary to further signal be handled, inhibit invalid information, obtain useful defect letter Breath, it is higher using the modulating frequency of flaw indication, and the feature that other interference information frequencies are lower, it is screened by high-pass filter The signal of different frequency filters low-frequency signals, exports high-frequency signal；After above-mentioned processing, may there are also it is some not by The slight residual noise curbed, such as the interference noise in ambient environment, detection and filtering can not press down completely it System is clean, and using amplitude discrimination circuit, effective reference level is arranged, and when input voltage is lower than reference level, circuit is not defeated Out, when input voltage is more than this preset value, signal can just be exported, as shown in -4.

Second stage is to carry out analog-to-digital conversion to the data of first stage output, and the analog data of output is converted into counting Word amount data, then carry out the data processing work of next stage.Since the signal of first stage output is the company corresponding to defect Continuous voltage signal, this cannot be identified by computer, received, handled, and need to be converted into corresponding to the discontinuous of defect Digital quantity voltage signal, by data collecting card carry out A D convert, make the computer-readable data write and operated. Why select this data collecting card to carry out A/D conversion to data, is because it is suitable for carrying out batch reading to mass data It takes, to mass data high speed continuous acquisition, and equipment use is stable, reliable, easy to operate.This data collecting card is good The features such as meeting the rapidity, real-time, a large amount of property of this welding quality inspection system detection data.For weldquality information For, the data detected are more, more true, accurate can react the good-looking bad of weldquality.

The key that data format is converted as A/D, for this system, AD initial data is converted into taking after voltage value Volt Value range is, and is stored in TXT file.

Phase III, for weldquality, the analysis, processing, image for carrying out digital data are shown, result prompts. Data by readings, storage, curve matching, matching evaluation, emergence show, result prompt etc. processes, by process shown in -5 into Row processing.A/D acquisition module is in the open state, when receiving welding commencing signal, calls scribing line subprogram to adopting in real time The data of collection are fitted display；Meanwhile the reading of data, storage are carried out, and when receiving welding end trigger signal, access End of data, A/D acquisition module close, initial data are stored in TXT file；In next step, the song being fitted by initial data Line will be matched with the figure-of-merit curve in database, and by the evaluation of interpretational criteria, automatic Evaluation result is qualified Weld seam can be prompted in display module, and result is stored in ACCESS database, for statistics from now on, investigation It uses；Opposite, automatic Evaluation result is underproof weld seam, is equally shown in display module, and " unqualified " Result information be also stored in ACCESS database, meanwhile, warning device can provide warning automatically, prompt operator " no The testing result of qualification ", please be gone through, and carry out next step operation, such as the tune of narrow gap electric resistance welding welding machine parameter Whole and weld seam welding again etc..

ACCESS has the ability of data processing, statistical analysis, while can also utilize the query function of ACCESS, carries out It is all kinds of the statistics such as to summarize, be averaged.The later period is met to the statistical analysis of the condition of production and the weld inspection system service condition Analysis, provide a large amount of data information to continuously improve and optimizing the weld inspection system.

As described above, current vortex sensor is lip pencil, and diameter 8mm detects weldquality information.Sensor detects Initial data will be handled by amplifier, wave detector, phase shifter, filter etc. by pretreatment, eventually pass through the data of processing By preventing the signal wire of external interference to be transferred to data collecting card, converted by A/D, analog data is converted into digital quantity.

The voltage data of digital quantity is carried out curve fitting by least square method.Why select least square method to curve It is fitted, is approached because preferably meeting actual demand in the process of processing to weld seam quality information curve Virtual condition, the method are simple and effective in data handling.

According to the present invention, it is relatively fixed to solve the problems, such as temperature probe temperature measuring point, and according to temperature point, feeds back to Welding machine information automatically adjusts welding machine parameter, guarantees welding quality；Analysis is solved by Pulsed eddy current testing, judges weldquality, It is effectively prevented from erroneous judgement caused by visual inspection, reduces equipment failure rate.

The weldquality on-line tuning and detection device have been successfully applied to No. 2 tin plating units of tin plate factory, Baogang Stocks Trading Co.. After the device, weld seam broken belt rate :≤1 ‰, so that it is guaranteed that the continuous production of tin plate, is effectively reduced disconnected with accident Occur, greatly improves Weld seam quality control level, ensure that high-caliber production efficiency.In continuous tin plating plate production process, break Band is the main reason for influencing continuous production and reduce efficiency.Since there are many Tin-Plating Production Lines in China, on these production lines It should be equipped with weldquality on-line measuring device, therefore had a extensive future.

Detailed description of the invention:

Fig. 1 is welder system flow chart of the invention.

Fig. 2 is welder device schematic diagram of the invention.

Fig. 2-1 is mounting bracket schematic diagram.

Fig. 2-2 is (differential type) eddy current probe schematic diagram.

Fig. 2-3 is the thermo parameters method schematic diagram in welding process inside (differential type) eddy current probe.

Fig. 3 is thermometric drive module schematic diagram of the invention.

Fig. 3-1 is the program flow chart of welding quality inspection evaluation system.

Fig. 3-2 is data signal transmission flow chart.

Fig. 3-3 is data-signal processing flow schematic diagram.

Fig. 3-4 is amplitude analysis method schematic diagram.

Fig. 3-5 flow chart of data processing block diagram.

In figure, 1- (differential type) eddy current probe, 2- welder support, the upper rolling wheel of 3-, rolling wheel under 4-, 5- upper welding wheel, 6- Weld seam, 7- thermometric drive module, welding wheel under 8-, 11-Z is to stepper motor, and 12-Y is to stepper motor, 13- probe bracket, 14-Z to Displacement sensor, 15- temperature probe, 16-Y is to displacement sensor.

In Fig. 2-3,

B respectively indicates+6.200e+02~+5.700e+02~temperature field+5.200e+02,

C-D respectively indicates+5.200e+02~+4.700e+02~temperature field+4.200e+02,

E-H respectively indicates+4.200e+02~+3.700e+02~3.200e+02~+2.700e+02~2.200e+02 temperature Field is spent,

I-J respectively indicates+2.200e+02~+1.700e+02~temperature field+1.200e+02,

K-L expression+1.200e+01~+7.000e+02~the temperature field+2.000e+01.

Specific embodiment

Embodiment:

System parameter

For narrow lap resistance welding, substrate plate thickness 0.14-0.19mm welding situation.

Temperature probe 15 selects electromagnetism interference and prevents dust, when installation, vertical range of the temperature measuring point apart from weld seam 6 For 3mm, the linear distance with lower 8 center of welding wheel is 105mm, guarantees thermometric dot center and the centering of welding wheel center, synchronous with welding machine Movement.

Pulse eddy current probe 1 is used to the detection of weldquality after welding, is mounted on narrow overlap resistance welding machine and rolls The rear of wheel 3 is moved synchronously apart from 5 1m or more of upper welding wheel with welding machine, guarantees the real-time of detection.Select Pulsed eddy current testing It is advantageous in that detection sensitivity is higher, is easy to inhibit noise when detecting signal processing, penetration depth when detection is bigger.

Displacement sensor (14,16) detects the variation of temperature probe 15Y axis and Z axis position respectively, and change information is passed through Embedded software in a computer is transferred to after A D conversion, instruction is sent an ARM7 module by software, and ARM7 sends pulse signal It controls Z-direction stepping motor 11 and Y-direction stepping motor 12 acts, drive lead screw mobile, the position of temperature probe 15 is finely adjusted, Guarantee that temperature measuring point is relatively fixed, to guarantee to measure accurate temperature.

6 temperature information of weld seam that temperature probe 15 will test is transferred to temperature data processing unit, temperature data processing Device does preliminary treatment to information, and the data handled well are transferred to temperature data acquisition module, temperature data acquisition module pair Information is further processed, and the information handled well is transferred in computer embedded software, and computer passes through serial ports and welding machine phase Even, software sends the instruction automatic adjustment real-time welding current of welding machine by comparison optimum temperature value, to guarantee that temperature probe detects The temperature arrived is constant.

The quality information of weld seam 6 after the welding of 1 real-time detection of pulse eddy current probe, the original data transmissions that will test are to matter Data processing equipment is measured, qualitative data processing unit does preliminary treatment to initial data, the data handled well are transferred to quality Data acquisition module, quality data collection module are further processed data, and the data handled well are transferred in computer In embedding software, pass through the weldquality information curve progress for calling the quality information curve in database and real-time detection to arrive Match.Allowing figure-of-merit curve similarity less than 100% less than 80%, or with greatest drawback with best curve similarity, Computer sends instruction, and display module shows that judging result is " unqualified ", and warning device carries out warning note.

Display module real-time display temperature measuring point situation, the adjusting situation of welder parameter, front and back welding coil of strip letter The real time information curve of weldquality, final analysis, judging result etc. after breath, welding.

Warning device carries out warning note when display module shows " unqualified "；When display module shows " qualification ", report Alarm device keeps silent.

Using effect

Front and back is installed and used in weldquality evaluation system, the disconnected band quantity of 1220 tin plating units significantly reduces.As shown.

Disconnected band number of each month before and after the use of table weldquality evaluation system

Before the system is installed and used, the January to May, averagely disconnected band quantity was 6, after use from June to eight In month, the average band that monthly breaks is 2, and it is to cause weldquality to be generally reduced due to welder equipment failure that the disconnected band of August part, which increases, It is caused.The use of weldquality evaluating apparatus, hence it is evident that reduce the quantity of the disconnected band of weld seam, it can be seen that the system is plated for improving The weldquality of tin unit, the disconnected band of prevention weld seam play very useful effect.

Influence weld seam break band factor it is more, the specification of such as production of each month is different, move ahead strip and rear row strip Difference, the chance failure of welding machine are all to cause the potential factor of disconnected band, therefore the disconnected band situation of every month has sizable wave It is dynamic, but causing the immediate cause of the disconnected band of weld seam is operator to the inaccuracy in weld seam quality assessment, is caused defective Weld seam enter milling train and cause disconnected band.After the system is installed and used, weld seam break band the phenomenon that be greatly reduced, be due to welding Seam quality has been improved, and the accuracy in terms of judge reduces problematic weld seam into rear road there has also been increasing substantially Process.

The design of eddy current probe bogey

Eddy current probe is in the condition of high temperature when detecting, can be to the detection of probe if detected using ordinary ultrasonic probe Performance causes very big influence, it is therefore necessary to must develop a eddy current probe resistant to high temperature.Eddy current probe during installation, needs to make Eddy current probe keeps constant distance 1-2mm between face of weld.

The design of eddy current probe

Since the defect being primarily present in weld seam is burn-through and incomplete fusion etc., belong to saltant type defect, therefore using poor Dynamic formula probe sensor is scanned sample.Probe when detecting, moved along the gap between two clamping platforms, two clamping platforms it Between gap be 10mm, the diameter of all probes should be less than 10mm, but the diameter popped one's head in is too small, will affect coiling and the letter of probe Number acquisition, take probe diameter D=8mm after tradeoff.

According to welding temperature calculated result, 200 DEG C must not be higher than for target, to sonde configuration to be vortexed interior metal core temperature It optimizes, finally obtains following eddy current probe, size is as shown in 2-2.

Eddy current probe is apart from welding gun 1000mm, and when welding, probe bottom temp is about 320 DEG C, in welding process, in probe The Temperature Distribution in portion is as Figure 2-3.

For metal core Temperature Distribution as shown in 2-3, maximum temperature is lower than 200 DEG C in popping one's head in, and meets maximum operating temperature and wants It asks.By live actual measurement, which is entirely capable of bearing thermal shock in welding overall process, and functional stabilization can be examined effectively Measure the defect inside weld seam.When the probe detects at the scene, received signal noise is small, in stable condition, fully meets scene Testing requirements.It adds, is not susceptible to break bad, at low cost, coil discreteness is distributed, and performance is good, can be had very long Service life.The probe is not susceptible to break bad, and at low cost, coil discreteness is distributed, and performance is good, can be had very long Service life.

Claims

1. a kind of method for improving narrow lap welder weldquality, which is characterized in that include the following steps:

1) control of the temp probe to soldering joint automatic tracking

Thermometric drive module (7) is mounted on lower welding wheel (8) front end, close to weld, weld point temperature when detection is welded, thermometric is driven Dynamic model block (7) includes stepper motor (11,12), displacement sensor (14,16), temperature probe (15) and probe bracket (13), position Displacement sensor detect temperature probe vertical direction (i.e. Y-axis gravity direction) and vertical X axis, Y-axis Z-direction weld point temperature,

If weld seam fluctuations in the vertical direction, information is collected by Y-direction displacement sensor 16, by information by A D turn Be transferred to embedded software in a computer after changing, after the data of software analyte sensors, determine Y-direction whether need to adjust and Adjustment amount number, then send an instruction to ARM7 module, ARM7 control Y-direction stepping motor (12) keeps temperature probe (15) dynamic Make to guarantee that temperature measuring point Y-direction position is relatively fixed；

Equally, the displacement difference in Z-direction between lower welding wheel (8) is detected by Z-direction displacement sensor, passes through A/D module and calculating The analysis of machine finally controls the movement of Z-direction stepping motor (11), thus guarantees the temperature probe in Y-direction, Z-direction simultaneously (15) relative position realizes the control to soldering joint automatic tracking,

2) temperature for keeping temperature probe to detect is constant,

The temperature information that temperature probe (15) will test is transferred to temperature data processor, and temperature data processor does information The data handled well are transferred to temperature data acquisition module by preliminary treatment, and temperature data acquisition module does further information Processing, the information handled well is transferred in computer embedded software, software is by further locating temperature data acquisition module The information and optimum temperature value of reason compare, and send regulating command and automatically adjust the real-time welding current of welding machine, to guarantee temperature probe The temperature detected is kept constant；

3) on-line checking, evaluation are carried out to weldquality,

A is firstly, determine the influence degree of welding parameter butt welding seam welding quality by orthogonal experiment, and thermometric is visited when determining to weld The optimum temperature that head should detect；

B determines that optimal quality is believed by the convex experiment of experience and 25-35 secondary cup secondly, to substrate plate progress Welding experiment Breath curve and greatest drawback allow figure-of-merit curve, establish figure-of-merit curve database；

Weldquality information after the welding of c real-time detection, weldquality original data transmissions are to mass number after the welding that will test According to processor, qualitative data processor does preliminary treatment to initial data, and the data handled well are transferred to quality data collection Module；

D quality data collection module is further processed data, and the data handled well are transferred in computer embedded software, By call quality information curve and real-time detection in database to weldquality information curve matched,

The weldquality information curve that quality information curve in e such as database, i.e. best curve similarity and real-time detection arrive 80% or more, display module is shown " qualification " similarity, and warning device is silent；

Such as the quality information curve in database, i.e. the weldquality information curve phase that is arrived with real-time detection of best curve similarity Like degree 80% hereinafter, display module is shown " unqualified ", warning device carries out warning note.

2. a kind of method for improving narrow lap welder weldquality as described in claim 1, which is characterized in that

In the e of step 3), the adjusting situation of display module real-time display welder parameter is welded coil of strip information, is welded after welding Stitch the real time information curve of quality, final analysis, judging result etc..

3. a kind of method for improving narrow lap welder weldquality as described in claim 1, which is characterized in that

In step, 3) a, when carrying out Welding experiment to substrate plate, move ahead coil of strip plate thickness 0.14-0.19mm, rear row rolled steel plate Thick 0.14-0.19mm carries out 25-35 welding and the convex experiment of cup, determines the best temperature that temperature probe should detect when welding Degree.

4. a kind of method for improving narrow lap welder weldquality as described in claim 1, which is characterized in that

In step 1), thermometric drive module (7) is mounted on lower welding wheel (8) front end close to weld, detects solder joint temperature when welding Degree.

5. a kind of method for improving narrow lap welder weldquality as described in claim 1, which is characterized in that

In step, 3) thermometric drive module (7), is mounted on the rear of upper rolling wheel 3, weld seam matter after real-time detection welding by c Measure information.

6. a kind of method for improving narrow lap welder weldquality as described in claim 1, which is characterized in that

In step, 3) b, passes through the experimental datas such as EDDY CURRENT, tension test, metallographic test and field working conditions and artificial warp It tests, determines optimal weldquality information curve y* (x), hold for the excessive greatest drawback for generating burn-through defect of welding current Perhaps figure-of-merit curve a* (x) and the greatest drawback for the too small generation incomplete fusion defect of welding current allow figure-of-merit curve b* (x).

7. a kind of method for improving narrow lap welder weldquality as described in claim 1, which is characterized in that

In step, 3) e:

(1) such as weldquality curve y (x) and best in quality information curve y* (x) similarity judge weldquality not less than 80% Qualification, weld seam need to weld again；Conversely, being judged as qualified, allow to let pass；

(2) such as y (x) and greatest drawback allow figure-of-merit curve a* (x) similarity to be greater than 95%, judge that weld seam is unqualified, and weld seam needs Again it welds；Conversely, being judged as qualified, allow to let pass；

(3) such as y (x) and greatest drawback allow figure-of-merit curve b* (x) similarity to be greater than 95%, judge that weld seam is unqualified, and weld seam needs Again it welds；Conversely, being judged as qualified, allow to let pass.

8. a kind of method for improving narrow lap welder weldquality as claimed in claim 7, which is characterized in that

In step, 3) e:

(4) A/D conversion is carried out to data by data collecting card, analog data is converted into digital quantity voltage value Volt (i)； If data Volt (i) is greater than the greatest drawback peak value allowed, that is, the defect threshold value MAX1 of incomplete fusion defective value is corresponded to, calculates it Number N1 judges that weldquality is unqualified, weld seam need to weld again if ratio N1/n is greater than 60%；

Conversely, being judged as qualified, allow to let pass；

(5) as data Volt (i) be less than defect threshold value MAX2 (data Volt (i) and defect threshold values MAX2 must be illustrated and Its source), its number N2 is calculated, ratio N2/n is greater than 30%, judges that weldquality is unqualified, weld seam need to weld again；

Conversely, being judged as qualified, allow to let pass；

(6) such as data Volt (i) is greater than all statistical average AVG, calculates its number N3, if ratio N3/n is greater than 50%, sentences Be broken seam it is off quality, weld seam need to weld again；

Conversely, being judged as qualified, allow to let pass；

9. a kind of method for improving narrow lap welder weldquality as claimed in claim 8, which is characterized in that

In step, 3) e:

(7) if the numerical value of Volt (i) and Volt (i+1) differs greatly, judge that burn-through situation is locally present in weld seam, prompt operative employee People checks face of weld situation and adjustment welding machine parameter etc. in time.

(8) if continuous several above defect threshold values of Volt (i) and fluctuation is very small, illustrate that presence is along weld seam this within the scope of The biggish burn-through of length direction or incomplete fusion situation, this weld seam judge qualified or not, the situation according to the length of axial crack 20% for length judges that weld seam is unqualified, needs to weld again.

10. a kind of method for improving narrow lap welder weldquality as described in claim 1, which is characterized in that

Detection is scanned to sample using differential type probe sensor, during installation, needs to make differential type probe and weld seam table The distance 1-2mm kept constant between face.

11. a kind of method for improving narrow lap welder weldquality as claimed in claim 10, which is characterized in that

It when being scanned detection to sample using differential type probe sensor, is moved along the gap between two clamping platforms, two clamp Gap between platform is 8-10mm, the diameter 6-10mm of differential type probe.

12. a kind of method for improving narrow lap welder weldquality as described in claim 1, which is characterized in that

13. a kind of device for improving narrow lap welder weldquality, which is characterized in that

If weld seam fluctuations in the vertical direction, collect information by Y-direction displacement sensor (16), by information by A D Be transferred to embedded software in a computer after conversion, after the data of software analyte sensors, determine Y-direction whether need to adjust with And adjustment amount number, then send an instruction to ARM7 module, ARM7 control Y-direction stepping motor 12 keeps temperature probe (15) dynamic Make to guarantee that temperature measuring point Y-direction position is relatively fixed；

Equally, the displacement difference in Z-direction between lower welding wheel (8) is detected by Z-direction displacement sensor, passes through A/D module and calculating The analysis of machine finally controls the movement of Z-direction stepping motor (11), thus guarantees the temperature probe in Y-direction, Z-direction simultaneously (15) control to soldering joint automatic tracking is realized in relative position.

14. a kind of method for improving narrow lap welder weldquality as claimed in claim 13, which is characterized in that

15. a kind of method for improving narrow lap welder weldquality as claimed in claim 13, which is characterized in that

Sample is scanned using differential type probe sensor, when detection, is moved along the gap between two clamping platforms, two clamp Gap between platform is 8-10mm, the diameter 6-10mm of differential type probe.

16. a kind of method for improving narrow lap welder weldquality as claimed in claim 13, which is characterized in that